As the concentration of a solution increases, its vapor pressure decreases. For a nonvolatile solute B in a liquid solvent A, the relationship between concentration and vapor pressure is expressed by Raoult's law: PA=XAPA where PA is the vapor pressure of the solution, XA is the mole fraction of solvent, and PA is the vapor pressure of the pure solvent. In a two-component solution consisting of A and B, the mole fraction, X, of component A is defined as XA=molesA+molesBmolesA If 0.520mol of a nonvolatile nonelectrolyte are dissolved in 3.90mol of water, what is the vapor pressure PH2O of the resulting solution? The vapor pressure of pure water is 23.8 torr at 25C. Express your answer numerically in torr. Solutions containing volatile solutes In solutions composed of two liquids ( A and B ), each liquid contributes to the total vapor pressure above the solution. The total vapor pressure is the sum of the partial pressures of the components: Ptotal=PA+PB=XAP+XBPB A solution is composed of 1.30mol cyclohexane (Pcy=97.6 torr) and 2.40mol acetone (Pac=229.5 torr). What is the total vapor pressure Ptotal above this solution? Express your answer numerically in torr